I finished covering and painting my balsa usa sopwith pup. Took it to a fun fly to just show off. Within fifteen minuets out in the sun the seams on the wings started to separate. Never had this problem before. Right now the only fix I can think of instead of starting from scratch is to nail in brads along ribs and epoxy the seams. I did finish plane in latex. Is there a clear sealer I could paint over that would help prevent this or am I screwed.